// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_WM_CORE_CURSOR_MANAGER_H_
#define UI_WM_CORE_CURSOR_MANAGER_H_

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#include "ui/aura/client/cursor_client.h"
#include "ui/base/cursor/cursor.h"
#include "ui/gfx/geometry/point.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/wm/core/native_cursor_manager_delegate.h"
#include "ui/wm/wm_export.h"

namespace gfx {
class Display;
}

namespace ui {
class KeyEvent;
}

namespace wm {

namespace internal {
    class CursorState;
}

class NativeCursorManager;

// This class receives requests to change cursor properties, as well as
// requests to queue any further changes until a later time. It sends changes
// to the NativeCursorManager, which communicates back to us when these changes
// were made through the NativeCursorManagerDelegate interface.
class WM_EXPORT CursorManager : public aura::client::CursorClient,
                                public NativeCursorManagerDelegate {
public:
    explicit CursorManager(scoped_ptr<NativeCursorManager> delegate);
    ~CursorManager() override;

    // Overridden from aura::client::CursorClient:
    void SetCursor(gfx::NativeCursor) override;
    gfx::NativeCursor GetCursor() const override;
    void ShowCursor() override;
    void HideCursor() override;
    bool IsCursorVisible() const override;
    void SetCursorSet(ui::CursorSetType cursor_set) override;
    ui::CursorSetType GetCursorSet() const override;
    void EnableMouseEvents() override;
    void DisableMouseEvents() override;
    bool IsMouseEventsEnabled() const override;
    void SetDisplay(const gfx::Display& display) override;
    void LockCursor() override;
    void UnlockCursor() override;
    bool IsCursorLocked() const override;
    void AddObserver(aura::client::CursorClientObserver* observer) override;
    void RemoveObserver(aura::client::CursorClientObserver* observer) override;
    bool ShouldHideCursorOnKeyEvent(const ui::KeyEvent& event) const override;

private:
    // Overridden from NativeCursorManagerDelegate:
    void CommitCursor(gfx::NativeCursor cursor) override;
    void CommitVisibility(bool visible) override;
    void CommitCursorSet(ui::CursorSetType cursor_set) override;
    void CommitMouseEventsEnabled(bool enabled) override;

    scoped_ptr<NativeCursorManager> delegate_;

    // Number of times LockCursor() has been invoked without a corresponding
    // UnlockCursor().
    int cursor_lock_count_;

    // The current state of the cursor.
    scoped_ptr<internal::CursorState> current_state_;

    // The cursor state to restore when the cursor is unlocked.
    scoped_ptr<internal::CursorState> state_on_unlock_;

    base::ObserverList<aura::client::CursorClientObserver> observers_;

    DISALLOW_COPY_AND_ASSIGN(CursorManager);
};

} // namespace wm

#endif // UI_WM_CORE_CURSOR_MANAGER_H_
